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Apple rolled out free "Find my iPhone" for those on iOS 4.2 with an iPhone 4.
The nicest part is, you can programmatically track your iPhone 4 now "with an unofficial API".... for free!!!!
Plenty of examples in Ruby and PHP.
# Over-rides your full name from Unix password file. Required for PC-Alpine.
personal-name=YOUR_NAME
# Sets domain part of From: and local addresses in outgoing mail.
user-domain=gmail.com
# List of SMTP servers for sending mail. If blank: Unix Alpine uses sendmail.
smtp-server=smtp.gmail.com:587/tls/novalidate-cert/user=YOUR_GMAIL_USERNAME@gmail.com
# Path of (local or remote) INBOX, e.g. ={mail.somewhere.edu}inbox
# Normal Unix default is the local INBOX (usually /usr/spool/mail/$USER).
inbox-path={imap.gmail.com/ssl/novalidate-cert/user=YOUR_GMAIL_USERNAME@gmail.com}inbox